thumb|Caleb Mills from Who-When-What Book, 1900 Caleb Mills (July 28, 1806 – October 16, 1879) was an American educator who served as the Superintendent of Public Instruction in Indiana and was the fi
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd160fe4b6538f96a305c461dbb337948f5072831c0eae505f085c10cc79f3207. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/856f6716-708f-4545-b048-2c2d7e04fa1c.json and https://artists.proofprofile.net/proofs/artist/856f6716-708f-4545-b048-2c2d7e04fa1c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8691d7677ef42210aeb63388563f1744197fe636992edf3764acb19a465266b. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6M1922932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd58368f247690b9c2d8f96e2cddaf16a60e57fde49d042edba0ca0657d03fc71. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTAU2136864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1342837139f9ca6be26d5121efaa543ec81efab1cdccdce53418562836b6ecd0. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWX2277429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a704ce99070c2f88eb3da2b73c2942be4efba45f1ddce34af1a185c972fcd9b. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTBB2239201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3a1fa2925e09f893385971019157791ba173fefe1794dd119654806cf2cd1e7. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTBB2239202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fa264f26f2189a510d5805ba1acf9fbe67691102ef978359127144d1700f88a. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHNC2341913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f6792301e8f97a5bb579acc8adb35eb7477f8435db7af89e7b4ba05f0737115. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWR2359757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x322398bc211d8aa99d0318c49f24358a1b6e60513d3d0f475f0dc01c81d32f2f. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZWFQ2346415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fa264f26f2189a510d5805ba1acf9fbe67691102ef978359127144d1700f88a. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHNC2341913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd553432450fe4fc5f6b639b83c3138cd9e4e2d49220428c4402290c96acae71a. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFYY2468813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x322398bc211d8aa99d0318c49f24358a1b6e60513d3d0f475f0dc01c81d32f2f. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZWFQ2346415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffeee28baeaa8a1b2b31c4d8ecdd4d0d13df18e4df239d23a8aff53a89855e31. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFYY2468815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f6792301e8f97a5bb579acc8adb35eb7477f8435db7af89e7b4ba05f0737115. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWR2359757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc402e3926783d56ef792cca9784feae170813bb5f757b2e97b23cba09adff913. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZMEP2419682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfed58891204f384769daa580ec0f5a546f619652d7ec737845ae4bbf28b5083. Chain 2 (Bitcoin): anchored in block 958341 (2026-07-17T01:08:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTAY2493759.